FOEAMINIFERA OF THE WEST OF SCOTLAND. 219 



Subfamily Saccammininj;. 



Psamjiosph^ra, Schulze. 



59. Psammospliaera fusca, Sclmlze. 



Psammosphcera fusca, Schulze, 1874, R. p. 113, pi. ii. fig. 8. 



„ Brady, 1884, FC. p. 249, pi. xvi;i. figs. 1-8. 

 4 Stations. 



Extremely rare, but an occasional specimen, botb free and adherent. 



60. Psammosphaera bowmanni, Heron-Allen & Earland. 



Psammospluera bowmanni, Heron-Allen & Earland, 1912, etc., NSG. 1912, p. 385, pi. v. figs. 5, 6, 

 pi. vi. fig. 5 ; 1913, CI. p. 39. 



2 Stations. 



One typical example at each Stn. 



Cmthionina, Goes. 



61. Critliionina mamilla, Goes. 



Crit hicnina mamilla, Goes, 1894, ASF. p. 15, pi. iii. figs. 34-36. 



„ „ Heron-Allen & Earland, 1912, etc., NSG. 1913, p. 9, pi. iii. 



6 Stations. 



Occasional specimens, free or attached. Very rare, except at Stn. 4, where the 

 specimens were numerous. As found by us they are nearly all detached, but have 

 evidently been sessile when living. They are large, rather thick-walled, consisting of 

 extremely fine and very friable white sandy material, the central cavity large and filled 

 with dried protoplasm. At Stn. 4 hardly any sponge-spicules or shell-fragments are 

 incorporated in the shell-wall, but at the other Stns. small foraminifera and sponge- 

 spicules form, as usual, a large proportion of the bulk of the test. 



The question of the validity of Goes's genus Critliionina as distinct from Schulze's 

 earlier genus Storthosphcera seems somewhat doubtful. Storthosphcera is distinguished 

 by thick shell-walls, built up of fine sand-grains and without visible aperture, the 

 central cavity being large and undivided ; Critliionina, on the other hand, is defined by 

 Goes as having the central cavity either labyrinthic or undivided. As the character of 

 the shell-wall is the same in the two genera, it would seem desirable that the species 

 of Critliionina with undivided cavity should be transferred to Storthosphcera. 



As a recent British species this has only been recorded by us from Clare Island and 

 the North Sea (lit supra), but we have numerous records of it from ' Goldseeker ' 

 dredgings. 



Subfamily Rhabdammininji. 

 Jaculella, Brady. 



62. Jaculella acuta, Brady. 



Jaculella acuta, Brady, 1879, etc., RRC. 1879, p. 35, pi. iii. figs. 12, 13. 

 „ „ Brady, 1884, FC. p. 255, pi. xxii. figs. 14-18. 





